Improvement in glass-molds



UNITED STATES PAT NT OEEIoE.

BENJAMIN BAKEWELL, JR., 0E PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN GLASS-MOLDS. I

S peeifieltion forming part of Letters Patent No. 159.062 dated January 26, 1875; appli.ation filed November 30, 1874. I

To whdm it mag/concern Be it known that I, BENJAMIN BAKEWELL,

' .112, of Bittsburg, in the county of Allegheny .-'and State of Pennsylvania, have invented a part of this specification, in which- Figure 1 is a vertical transverse section of a mold,ring, and plunger. Fig. 2 is a plan view ofthe mold, and Fig.- 3 is a view of the ring and face of the plunger. 7 Like letters refer to like parts wherever they occur. E

My invention relates to the manner of forming molds for the production of pressed glass articles of fluted or corrugated patterns; and it consists in forming the faces of the mold and plunger so that the convexities of one shall coincide with the concavities of the other, whereby uniformity of outline is obtained in the article produced, and the brilliancy of the pattern is increased, owing to the refraction of the light.

In illustrating my invention I have selected from the various shapes to which the invention is applicable a pattern of the shell form, and the molds and plungers shown in the drawing, and which I shall now proceed to describe, are conformed=thereto.

A represents the mold, having a concavefam formed of the flutes or corrugations a, a, converging to the point a the flutes terminating evenly on a" line corresponding to the plane of the recess 1 said recess forming the seat of the ring B. In the present instance, the seat a. is slightly inclined, as is also the underface of ring B, to preserve the outline of the shell. B is the ring, which fits within the recess or seat a of the mold, and is made to project slightly beyond the concavity. of the mold, as shown at b, so as to limit the molten glass and preserve the horizontal scalloped edge of the pattern. 0 indicates the plunger, having a convex face formed of flutes o o,

converging to the pointc. This plunger is the reverse of the mold, having the same number and arrangement of convexities that the mold has of concavities, so that the one shall fit within the other, due allowance being made for the requisite thickness of the article scent of the plunger will force the glass into all the concavities of the mold, while the convexities of the plunger, coinciding' w1th the concavities of the mold, will flute the glass, so as to give uniformity of outline, and increase the brilliancy of tliepattern from the refraction consequent upon the form given.

-Where the ring projects beyond the concavities of the mold, as shown in the drawing, the article formed will have a horizontal scalloped edge, which adds greatly to its appearance and finish.

Having thus described my invention, so that a mold-maker skilled in the art can apply the same in the production of molds for articles of glassware, what I claim, anddesire to secure by Letters Patent, is-- 1. The mold and plunger having corrugated faces a 0, formed so that the convexities of one shall coincide with the concavities of the other, substantially as specified.

2. In combination with the mold and plunger having corrugated faces a c, a ring, B, projecting slightly beyond the edge of the concavity-of the mold, and having scallops I) to accommodate the plunger, substantially as 

